Iterator<List<Integer>> permutations = Collections2.orderedPermutations(list).iterator();

    assertNextPermutation(newArrayList(1), permutations);
    assertNoMorePermutations(permutations);
  }

  public void testOrderedPermutationSetThreeElements() {
    List<String> list = newArrayList("b", "a", "c");
    Iterator<List<String>> permutations = Collections2.orderedPermutations(list).iterator();